“Inverted” porphyrins: a distorted adsorption geometry of free-base porphyrins on Cu(111)

Abstract

Based on density functional theory calculations combined with experimental results, we report and discuss an extremely distorted, “inverted” adsorption geometry of free-base tetraphenylporphyrin on Cu(111). The current findings yield new insights into a well-studied system, shedding light on the peculiar molecule–substrate interaction and the resulting intramolecular conformation.